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    <title>Document</title>
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<script>
    //对象转查询字符串
    function Search(obj) {
        var str = ``
        for (const key in obj) {
            //将每个属性和属性值拼接为 key = value& 的形式
            str += `${key}=${obj[key]}&`
        }
        return str.slice(0, str.length - 1)
    }
    //封装ajax函数
    function ajax(method, url, params, cb) {
        var xhr = new XMLHttpRequest()
        xhr.open(method, url + "?" + Search(params))
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4) {
                cb(JSON.parse(xhr.responseText))
            }
        }
        xhr.send()
    }
    ajax('get', 'https://yantianfeng.com/api/emotion', { page: 1, count: 5 }, function (data) {
        console.log(data);
    })
</script>